Question

3x + 9y = 18
x + y =4

Answer 1

Explanation:

The given equation is 3x + 9y = -18. To correctly graph the equation, it would be helpful to write the equation in its slope-intercept form which is expressed as:

y = mx + b where m is the slope and b is the y value when x is 0 or the y-intercept.

3x + 9y = -18

9y= -3x -18

y= -1/3x - 2

Therefore, the slope would be -1/3 and the y-intercept is -2. You use these data to graph the equation.

Answer 2

Explanation:

x=3

y=1

3(3)+9(1)

9+9=18

3+1=4