ALGEBRA 1 WORKBOOK: Master the Skills of Algebra 1 by Patrick Donald

Author:Patrick, Donald [Patrick, Donald]
Language: eng
Format: epub
Published: 2019-12-12T16:00:00+00:00

The point where the two lines meet is the solution which is -3 and -4

Using substitution method to solve linear equation

Substitution method of solving

Find x and y in this equation

Given x+y =9, y = 2x-3

Solution

Let first equation be one x+y =9, and the other be equation two y = 2x-3

The second equation is y = 2x-3 substitute this value of y in the first one.

x+y =9

It will be x+2x-3 =9

Collect like terms

2x + x = 9 + 3

3x = 12

Divide both side by 3

We have =

X = 4, you can use any of the equation to look for the value of y, Let us use equation one

X+y = 9, substitute the value of x in the equation to get that of y

4+y =9

Y = 9-4

Y=5

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