Hi can someone explain how to work this out? !
you xxx

Solve for y, then plot (since x is the independent variable & y is the dependent variable)

x + 2y = 10

*subtract x from both sides, and divide both sides by 2 . . to get . .

y = -1/2x + 5

In slope intercept form:
y = mx + b

m = slope = -1/2 . . . the rise/run of the line . . . rise = -1 units, run = 2 units
b = y-intercept = 5 . . . where the line crosses the y-axis

(see the attached plot)